Channel information feedback method and apparatus, terminal and base station

Abstract

Provided is a channel information feedback method and apparatus, a terminal, and a base station. The method includes: determining, by a terminal, a feedback state parameter of channel information, where the channel information includes at least one of a number M of precoding vectors v1, v2, . . . , vM, a number G of amplitude coefficients A1, A2, . . . , AG, or a number K of phase coefficients P1, P2, . . . , PK, where M, G and K are all integers greater than or equal to 0; and feeding back, by the terminal, the channel information according to the determined feedback state parameter.

What is claimed is: 
     
       1. A channel information feedback method, comprising:
 determining, by a terminal, a feedback state parameter of channel information, wherein the channel information comprises at least one of a number M of precoding vectors v 1 , v 2 , . . . , v M , a number G of amplitude coefficients A 1 , A 2 , . . . , A G , or a number K of phase coefficients P 1 , P 2 , . . . , P K , wherein M, G and K are all integers greater than or equal to 0; and 
 feeding back, by the terminal, the channel information according to the determined feedback state parameter, 
 wherein the feedback state parameter comprises at least one of: 
 a number of amplitude coefficient quantization states; 
 a number of phase coefficient quantization states; 
 a relationship between the amplitude coefficients in the channel information and an antenna port; or 
 a relationship between the amplitude coefficients in the channel information and a transport layer. 
 
     
     
       2. The method of  claim 1 , wherein the terminal determines the feedback state parameter in at least one of the following manners:
 the feedback state parameter is determined according to configuration signaling sent by a base station, wherein the configuration signaling comprises higher-layer signaling; 
 the feedback state parameter is determined according to a physical channel for feeding back the channel information; and 
 the feedback state parameter is determined according to a number of reference signal ports. 
 
     
     
       3. The method of  claim 1 , wherein the feedback state parameter comprises at least a feedback mode, and the feedback mode comprises at least one of:
 joint quantization and feedback of the precoding vectors, the amplitude coefficients and the phase coefficients; or 
 joint quantization and feedback of the amplitude coefficients and a rank indication (RI). 
 
     
     
       4. The method of  claim 1 , wherein the M precoding vectors are divided into a number L of groups, wherein precoding vectors in an I-th group have at least one of: a same number of amplitude coefficient quantization states or a same number of phase coefficient quantization states, wherein I is a positive integer, L is an integer greater than 1, and l≤I≤L. 
     
     
       5. The method of  claim 4 , wherein the number of amplitude coefficient quantization states and/or the number of phase coefficient quantization states for each of the L groups are determined according to a feedback mode of the channel information. 
     
     
       6. The method of  claim 1 , wherein the feedback state parameter comprises: a number of precoding vectors fed back in the channel information. 
     
     
       7. The method of  claim 6 , wherein the number M of precoding vectors is determined according to a number R of reference signal ports of a base station, wherein R is a positive integer. 
     
     
       8. The method of  claim 1 , wherein the antenna port comprises a plurality of ports T 0 , T 1 , . . . , T B-1 , wherein amplitude coefficients and/or phase coefficients associated with a port T 0  to a port T B/2-1  are consistent with amplitude coefficients and/or phase coefficients associated with a port T B/2  to a port T B-1 , wherein B is an even number. 
     
     
       9. The method of  claim 1 , wherein when the transport layer comprises a number L of layers, different layers of the L layers have at least one same amplitude coefficient. 
     
     
       10. A channel information feedback apparatus, applied to a terminal, comprising:
 a processor; and 
 a memory for storing instructions executable by the processor, 
 wherein the processor is configured to implement the channel information feedback method of  claim 1 . 
 
     
     
       11. A channel information feedback method, comprising:
 sending, by a base station, configuration signaling to a terminal, wherein the configuration signaling is used for carrying a feedback state parameter of channel information and the channel information comprises at least one of a number M of precoding vectors v 1 , v 2 , . . . , v M , a number G of amplitude coefficients A 1 , A 2 , . . . , A G , or a number K of phase coefficients P 1 , P 2 , . . . , P K , wherein M, G and K are all integers greater than or equal to 0; and 
 receiving the channel information fed back by the terminal according to the feedback state parameter, 
 wherein the feedback state parameter comprises at least one of: 
 a number of amplitude coefficient quantization states; 
 a number of phase coefficient quantization states; 
 a relationship between the amplitude coefficients in the channel information and an antenna port; or 
 a relationship between the amplitude coefficients in the channel information and a transport layer. 
 
     
     
       12. The method of  claim 11 , wherein before sending, by the base station, the configuration signaling to the terminal, the method further comprises: determining, by the base station, the feedback state parameter carried in the configuration signaling in at least one of the following manners:
 the feedback state parameter is determined according to a physical channel for feeding back the channel information; and 
 the feedback state parameter is determined according to a number of reference signal ports. 
 
     
     
       13. The method of  claim 11 , wherein the feedback state parameter comprises at least a feedback mode, and the feedback mode comprises at least one of:
 joint quantization and feedback of the precoding vectors, the amplitude coefficients and the phase coefficients; or 
 joint quantization and feedback of the amplitude coefficients and a rank indication (RI). 
 
     
     
       14. The method of  claim 11 , wherein the M precoding vectors are divided into a number L of groups, wherein precoding vectors in an I-th group have at least one of: a same number of amplitude coefficient quantization states or a same number of phase coefficient quantization states, wherein I is a positive integer, L is an integer greater than 1, and l≤I≤L. 
     
     
       15. The method of  claim 14 , wherein the base station configures the number of amplitude coefficient quantization states and/or the number of phase coefficient quantization states for each of the L groups via signaling. 
     
     
       16. The method of  claim 11 , wherein the feedback state parameter comprises: a number of precoding vectors fed back in the channel information. 
     
     
       17. The method of  claim 16 , wherein the number M of precoding vectors is determined according to a number R of reference signal ports of the base station, wherein R is a positive integer. 
     
     
       18. The method of  claim 11 , wherein the antenna port comprises a plurality of ports T 0 , T 1 , . . . , T B-1 , wherein amplitude coefficients and/or phase coefficients associated with a port T 0  to a port T B/2-1  are consistent with amplitude coefficients and/or phase coefficients associated with a port T B/2  to a port T B-1 , wherein B is an even number. 
     
     
       19. The method of  claim 11 , wherein when the transport layer comprises a number L of layers, different layers of the L layers have at least one same amplitude coefficient. 
     
     
       20. A channel information feedback apparatus, applied to a base station, comprising:
 a processor; and 
 a memory for storing instructions executable by the processor, 
 wherein the processor is configured to implement the channel information feedback method of  claim 11 .